Author: SSWUG Research

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ASH basics

(Nikolay Savvinov) Active session history (ASH), available since 10g, is one of the greatest performance troubleshooting tools available for Oracle databases. And one of most underutilized, too. In this article I will give some basic guidelines regarding ASH usage, and will list some of my favorite

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Reducing the impact of locking

(Hans-Juergen Schoenig) “Waiting is the slowest way to execute an operation” – this is how a professor at my university in Vienna usually described bad locking and low concurrency. He could not have been more right. The same applies to performing calculations: The fastest way to calculate something